From 8a74b8aa90c8f0a23eba1949da2aa3431f430a57 Mon Sep 17 00:00:00 2001
From: Darcy Wong <darcy_wong@sil.org>
Date: Wed, 6 Nov 2019 13:11:45 +0700
Subject: [PATCH] fix(android): Skip if there's no left context to delete

---
 .../app/src/main/java/com/tavultesoft/kmea/KMManager.java  | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/android/KMEA/app/src/main/java/com/tavultesoft/kmea/KMManager.java b/android/KMEA/app/src/main/java/com/tavultesoft/kmea/KMManager.java
index a9a27f8728..b088670935 100644
--- a/android/KMEA/app/src/main/java/com/tavultesoft/kmea/KMManager.java
+++ b/android/KMEA/app/src/main/java/com/tavultesoft/kmea/KMManager.java
@@ -318,12 +318,17 @@ public final class KMManager {
   private static void performLeftDeletions(InputConnection ic, int dn) {
     int originalBufferLength = dn*2 + 16; // characters
     CharSequence charsBackup = ic.getTextBeforeCursor(originalBufferLength, 0);
+    int lastIndex = charsBackup.length()-1;
+
+    // Exit if there's no context to delete
+    if (lastIndex < 0) {
+      return;
+    }
 
     // Count the number of surrogate pairs in this buffer, backwards from the end
     // until we reach dn codepoints.
     // Unfortunately, can't foreach charSequence in reverse
     int numPairs = 0;
-    int lastIndex = charsBackup.length()-1;
     int counter=0;
     try {
       do {